oceanic trench
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Oceanic trench — Oceanic crust is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at trenches. The oceanic trenches are hemispheric scale long but narrow topographic depressions of the sea floor. They are also the… … Wikipedia
trench — /trench/, n. 1. Fort. a long, narrow excavation in the ground, the earth from which is thrown up in front to serve as a shelter from enemy fire or attack. 2. trenches, a system of such excavations, with their embankments, etc. 3. a deep furrow,… … Universalium
Trench — /trench/, n. Richard Chenevix /shen euh vee/, 1807 86, English clergyman and scholar, born in Ireland. * * * (as used in expressions) deep sea trench oceanic trench Mariana Trench trench warfare * * * … Universalium
Oceanic basin — Diagrammatic cross section of an ocean basin, showing the various geographic features Hydrologically, an oceanic basin may be anywhere on Earth that is covered by seawater, but geologically ocean basins are large geologic basins that are below… … Wikipedia
Oceanic crust — Age of oceanic crust. The red is most recent, and blue is the oldest. Oceanic crust is the part of Earth s lithosphere that surfaces in the ocean basins. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and… … Wikipedia
Oceanic plateau — An oceanic plateau (also submarine plateau) is a large, relatively flat submarine region that rises well above the level of the ambient seabed.[1] While many oceanic plateaus are composed of continental crust, and often form a step interrupting… … Wikipedia
Oceanic zone — Marine habitats The oceanic zone is the deep open ocean water that lies off the continental slopes Littoral zone Intertidal zone … Wikipedia
Trench — A trench is a type of excavation or depression in the ground. Trenches are generally defined by being deeper than they are wide (as opposed to a wider gully or ditch), and by being narrow compared to their length (as opposed to a simple hole). [… … Wikipedia
oceanic — /oh shee an ik/, adj. 1. of, living in, or produced by the ocean: oceanic currents. 2. of or pertaining to the region of water lying above the bathyal, abyssal, and hadal zones of the sea bottom. Cf. neritic, pelagic. 3. immensely large; vast: an … Universalium
oceanic abyss — noun a long steep sided depression in the ocean floor • Syn: ↑trench, ↑deep • Hypernyms: ↑natural depression, ↑depression • Instance Hyponyms: ↑Atacama Trench, ↑Bougainville Trench … Useful english dictionary
